KB Piano will turn your computer into a piano and more.
Easily create song with multiple instruments (guitar, bass, drums, and vocals from your microphone).
If you don't know music theory, use the application tools to automatically create guitar, bass, drums, and piano parts. Not only you will be creating music, but at the same time you learn the basic music theory.
Once finished, export your project to midi and wave files and listen to them in most audio player software.
If you want to create your own songs, give KB Piano a try !